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It lasts for 13-18 hours per charge. It also charges your phone. Made of high-tech aircraft-grade aluminum and ABS materialrt and durability. We only use premium chip to control heat settings, safety is always the priority. Curved Shapes and Sleek Design.This electric USB pocket hand warmer is the best gift for girlfriends,parents and children. Warm her hands and her heart.This portable hand warmers perfect fits and no longer cold in this winter. This graphene hand warmer is super thermostatic and will warm your dog's bed all night long, so she won't shiver anymore!